Automatic stoker.



J. R. FORTUNE.

' AUTOMATICSTOKER.

APPLICATION FILED JAN.16. 1914.

Patented July 25, 1916.

Z'SHEETS-SHEET 1- UEUEEEIBIEIEU [DIUUIEBUIU l. R. FORTUNE.

AUTOMATIC STOKER.

APPLICATION FILED JAN--16. 1914.

PatentedJu1y25,1916.

2 SHEETS-SHEET 2.

JOHN R. FORTUNE, OF DETROIT, MICHIGAN.

AUTOMATIC STOKER.

To all whom it may concern:

Be it known that I, JOHN R. FORTUNE, a citizen of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Automatic Stoker's, of which the following is a specification, reference being had therein to the accompanying drawing In the operation of automatic stokers of the class in which power driven stoker boxes are employed to feed coal from the throat of a magazine, one side of which. throat is formed by an arch plate having an inclined lower end portion, it is found that the coal is liable to become clogged in the throat preventing the feeding or causing a breakage of the stoker box operating mechanism.

To obviate this difficulty and to provide certain other new and useful features in the construction and arrangement of parts, is an object of this invention, and with. this and other ends in view the invention consists in the matters hereinafter set forth and more particularly pointed out in the appended claims, reference being had to the accompanying drawings in which Figure 1 is a transverse vertical section through a furnace embodying an automatic stoker showing means embodying this invention in operative relation thereto; Fig. 2 is an enlarged transverse vertical section through one of the magazines and adjacent parts of the stoker; and Fig. 3 is a perspec- 1 tive view of the same.

An automatic stoker of an old and well known type is shown in the accompanying drawings to illustrate the construction and operation of the device embodying the invention in connection therewith, but it will be understood that the invention may be applied to other forms of automatic stokers.

In Fig. l of the drawings two series of inclined grate bars A are shown as supported at their lower ends upon a grate bearer B, with their upper ends resting against the edge of coking plates C arranged beneath the mouth or throat D of a suitable hopper or magazine E. Reciprocable across the coking plate and across the shell of each magazine, is a series of stoker boxes F actuated by a quadrant G secured upon a shaft H extending longitudinally beneath the boxes. The inner side of each magazine is formed by an arch plate I provided with seats J and K for an inner arch L and outer Specification of Letters Patent.

Patented July 25, 1916.

Application filed January 16, 1914. Serial No. 812,590.

When the stoker boxes F are moved inwardly beneath the hopper and across its throat, a portion of the coal passing down the throat is pushed across the coking plate on to the upper ends of the grate bars, but the tendency of the pushing movement is to force the coal which lies directly above the path of the box, toward and into contact with the lower inclined face of the arch seat J which forms the upper side of the throat in the usual construction. When the coal contains many large lumps these lumps are liable to become wedged in the throat and also when the coal is fine and wet, it is liable to pack in the throat against the lower surface of the arch seat due to the up ward pushing action of the stoker boxes as they move forward and the downward pres sure of the coal contained in'the magazine upon the coal in the throat.

In order to givev to the stoker boxes a shearing and crushing action against the coal as they move forward, an angle bar 10 of theproper size and shape is detachably secured againstthe lower face of the arch seat J and this bar is formed with a sharp angle or corner 11 along the: edge around which the coal passes in moving down the throat. This sharp corner is positioned a short distance above the horizontal plane of the upper surface of the stoker boxes and is preferably in the vertical plane of the inner surface of the archplate to which it is attached, said surface formmg the inner side of the magazine. Upon forward movement of the stoker boxes the lumps of coal caught in the throat are forced laterally and upwardly against the sharp angle 11 and are easily cut and crushed thereby. The packing of the coal in the throat is also prevented by the angle bar 10 as, upon the forward movement of the stoker boxes the coal will be either forced inwardly over the coking plate along the horizontal lower surface of the bar 10 or will be forced upwardly into the magazine along the vertical inner surface of the bar.

The bar 10 is detachably secured against the upper side of the throat by means of bolts 12, the heads of which are positioned within recesses 13 formed in the lower face of the horizontal flange of the bar. The edges of the vertical and horizontal flanges of the bar are beveled to fit against the upper surface of the throat and bring the lower flange of the bar in horizontal position andv the vertical flangewith its outer surface in the vertical plane of the surface of the arch plate. The outer surfaces of the two flanges of the bar meet to form the sharp angle 11 which surfaces are curved slightly to give an angle which is less than degrees in cross section. When the bar is secured in place against the lower surface of the arch scat J, an'air space or flue 14 is formed between the bar and seat extending the full length of the seat. 7 This air flue tends to keep the bar 10 cool so that the corner or angle will not be burned off in use, and the bar protects the upper side of the throat or lower arch seat. The bar thus forms an attachment for arch plates which may be readily taken off for the purpose of replacement or repair and when in place forms a cutting angle and also a protection for the arch plate. r 7 Obviously, changes may bemade in the form and arrangement of the bar embodying the invention, without departing from the spirit of the invention, and I do not therefore limit myself to the particular form shown.

Having thus fully described my invention what I claim is 1. In an automatic stoker, the combination with a magazine, one side of which is formed by an arch plate having a laterally extending lower end portion forming the upper side of the throat of the magazine, a horizontally disposed coking plate beneath saidend portion of the arch plate, andstoking devices movable horizontally across the coking plate, of a member secured to the arch plate with the lower surface of said member substantially parallel with the coking plate and meeting a free side sur,

face of the member at an angle positioned above the horizontal plane of the upper of said'boxes and secured to said lower surface of the endportion of the arch plate with the edges of its flanges in contact with said surface to form a longitudinal air channel w1th1n the angle of said flanges along 'the lower side of the arch seat throughout its length.

8. In an automatic stoker, the combination with a magazine, an arch plate forming one side of the magazine and having an inclined laterally extending lower end portion forming the upper side of the throat of the magazine, a coking plate forming the lower side of the throat, and Stoker boxes movable acrossthe throat over the coking plate, of I an angle bar formed of a pair of meeting flanges with the free edges of the flanges formed to fit against the lower surface of said inclined end of the arch plate with the lower surface of one flange substantially parallel with the coking plate and the outer surface of the vertical flange substantially in the vertical plane of the inner surface of the arch plate, said bar forming an air flue along the entire length of the arch-seat and its angle forming a cutting edge adjacent to, and above the path of movement of the Stoker plate, and means for detachably securing the bar in place upon the lower surface of said arch seat.

In testimony whereof I aflixiny signature in presence of two witnesses.

Y I JOHN R. FORTUNE.

Witnesses:

CALEB M. EARL,

f WVivL V. MoALLIsTnR.

Copies of this patent maybe obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. (1. 

